Porcine OCT4 Reporter System can Monitor Species-Specific Pluripotency During Somatic Cell Reprogramming

2020 ◽  
Author(s):  
Seung-Hun Kim ◽  
Kwang-Hwan Choi ◽  
Mingyun Lee ◽  
Dong-Kyung Lee ◽  
Chang-Kyu Lee
Keyword(s):  
Stem Cells ◽  
Pluripotent Stem Cells ◽  
Fluorescent Protein ◽  
Upstream Region ◽  
Reporter System ◽  
System L ◽  
Reporter Systems ◽  
Induced Pluripotent ◽  
Species Specific ◽  
Fluorescent Protein Reporter

Abstract l Background: The present study examined the activity and function of pig OCT4 enhancer in porcine reprogramming cells. Dual fluorescent protein reporter systems controlled by the upstream regulatory region of OCT4, which is one of the master regulators for pluripotency, are widely used in studies of the mechanism of pluripotency. We analyzed how this reporter system functions in FGF- or LIF-dependent reprogrammed porcine pluripotent stem cells using the previously established porcine-specific reporter system. l Results: Porcine embryonic fibroblasts were coinfected with the pOCT4-∆PE-eGFP (DE-GFP) and pOCT4-∆DE-DsRed2 (PE-RFP) vectors, and GFP and RFP expression was verified during a DOX-dependent reprogramming process. We demonstrated that the porcine OCT4 distal enhancer and proximal enhancer were activated in different expression patterns simultaneously as the changes in the expression of pluripotent marker genes during the establishment of porcine-induced pluripotent stem cells (iPSCs). l Conclusions: Porcine OCT4 upstream region-derived dual fluorescent protein reporter systems serve as live naïve/primed pluripotency indicators for porcine induced pluripotent cell establishment. This work demonstrates the applicability of the porcine OCT4 upstream region-derived dual fluorescence reporter system, which may be applied to investigations of species-specific pluripotency in porcine-origin cells. These reporter systems may be useful tools for studies of porcine-specific pluripotency, early embryo development and embryonic stem cells.

124 Functional analysis of porcine OCT4 transcriptional regulatory region-based reporter system

2019 ◽  
Vol 31 (1) ◽  
pp. 187
Author(s):  
S.-H. Kim ◽  
K.-H. Choi ◽  
D.-K. Lee ◽  
M. Lee ◽  
M.-H. Cho ◽  
...  
Keyword(s):  
Stem Cells ◽  
Functional Analysis ◽  
Embryonic Stem Cells ◽  
Promoter Region ◽  
Fluorescent Protein ◽  
Regulatory Region ◽  
Embryonic Stem ◽  
Upstream Region ◽  
Reporter Assay ◽  
Reporter System

Gene OCT4 plays pivotal roles in maintaining pluripotency of early mammalian embryonic development and embryonic stem cells. It is essential to establish a reporter system based on the OCT4 promoter region for the study of pluripotency. However, there is still a lack of sufficient information about the porcine OCT4 upstream reporter system. To improve our understanding of the porcine OCT4 regulatory region, first, we conducted an investigation to find conserved regions in the porcine OCT4 promoter upstream region by sequence-based comparative analysis using various mammalian genome sequences. A similarity of nucleotide sequences of the 5′ upstream region was low among mammalian species. However, the OCT4 promoter and 4 regulatory regions including distal and proximal enhancer elements have a high similarity. Next, a functional analysis of the porcine OCT4 promoter region was conducted. Luciferase reporter assay indicated that the porcine OCT4 distal enhancer and proximal enhancer are highly activated in mouse embryonic stem cells and embryonic carcinoma cells, respectively (n=3). Comparison analysis of naïve (Tbx3, Nr0b1, Rex1, Esrrb, Nanog, Klf2) or primed (Gata6, Mixl1, Fgf5, Otx2) state marker gene expression in a dual-reporter assay using pOCT4-DE-eGFP and pOCT4-PE-DsRed2 showed that expression of naïve and primed markers were up-regulated in cells with high green fluorescent protein and red fluorescent protein expression, respectively (n=3). Porcine OCT4-upstream region-based reporter constructs showed exclusive expression patterns depending on the state of pluripotency. This work could provide basic information for the porcine OCT4 upstream region and the various porcine OCT4-fluorescence reporter constructs, which can be applied to study species-specific pluripotency in early embryo development and for the establishment of embryonic stem cells in pigs. This work was supported by the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (IPET) through the Development of High Value-Added Food Technology Program, funded by the Ministry of Agriculture, Food and Rural Affairs (MAFRA, 118042-03-1-HD020).

scholarly journals Induced pluripotent stem cells-derived neurons from patients with Friedreich ataxia exhibit differential sensitivity to resveratrol and nicotinamide

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Pauline Georges ◽  
Maria-Gabriela Boza-Moran ◽  
Jacqueline Gide ◽  
Georges Arielle Pêche ◽  
Benjamin Forêt ◽  
...  
Keyword(s):  
Stem Cells ◽  
Drug Discovery ◽  
Pluripotent Stem Cells ◽  
Friedreich Ataxia ◽  
Cell Types ◽  
Differential Sensitivity ◽  
Human Ipscs ◽  
Induced Pluripotent ◽  
Species Specific

Abstract Translation of pharmacological results from in vitro cell testing to clinical trials is challenging. One of the causes that may underlie these discrepant results is the lack of the phenotypic or species-specific relevance of the tested cells; today, this lack of relevance may be reduced by relying on cells differentiated from human pluripotent stem cells. To analyse the benefits provided by this approach, we chose to focus on Friedreich ataxia, a neurodegenerative condition for which the recent clinical testing of two compounds was not successful. These compounds, namely, resveratrol and nicotinamide, were selected because they had been shown to stimulate the expression of frataxin in fibroblasts and lymphoblastoid cells. Our results indicated that these compounds failed to do so in iPSC-derived neurons generated from two patients with Friedreich ataxia. By comparing the effects of both molecules on different cell types that may be considered to be non-relevant for the disease, such as fibroblasts, or more relevant to the disease, such as neurons differentiated from iPSCs, a differential response was observed; this response suggests the importance of developing more predictive in vitro systems for drug discovery. Our results demonstrate the value of utilizing human iPSCs early in drug discovery to improve translational predictability.

scholarly journals A Closer Look to the Evolution of Neurons in Humans and Apes Using Stem-Cell-Derived Model Systems

2021 ◽  
Vol 9 ◽  
Author(s):  
Maria Schörnig ◽  
Elena Taverna
Keyword(s):  
Stem Cells ◽  
Pluripotent Stem Cells ◽  
Cell Biology ◽  
Model Systems ◽  
Post Mortem ◽  
Living Tissue ◽  
Closely Related Species ◽  
Important Species ◽  
Induced Pluripotent ◽  
Species Specific

The cellular, molecular and functional comparison of neurons from closely related species is crucial in evolutionary neurobiology. The access to living tissue and post-mortem brains of humans and non-human primates is limited and the state of the tissue might not allow recapitulating important species-specific differences. A valid alternative is offered by neurons derived from induced pluripotent stem cells (iPSCs) obtained from humans and non-human apes and primates. We will review herein the contribution of iPSCs-derived neuronal models to the field of evolutionary neurobiology, focusing on species-specific aspects of neuron’s cell biology and timing of maturation. In addition, we will discuss the use of iPSCs for the study of ancient human traits.

Purification of small molecule-induced cardiomyocytes from human induced pluripotent stem cells using a reporter system

2017 ◽  
Vol 232 (12) ◽  
pp. 3384-3395 ◽  
Author(s):  
Geun Hye Hwang ◽  
So Mi Park ◽  
Ho Jae Han ◽  
Joong Sun Kim ◽  
Seung Pil Yun ◽  
...  
Keyword(s):  
Stem Cells ◽  
Induced Pluripotent Stem Cells ◽  
Small Molecule ◽  
Pluripotent Stem Cells ◽  
Reporter System ◽  
Induced Pluripotent

scholarly journals Induced pluripotent stem cells differentiation into cardiomyocytes by rotating suspension culture and in specific plates with microwells

2016 ◽  
Vol 71 (1) ◽  
pp. 46-50
Author(s):  
G. Budash ◽  
N. Bilko
Keyword(s):  
Stem Cells ◽  
Ascorbic Acid ◽  
Suspension Culture ◽  
Cell Line ◽  
Pluripotent Stem Cells ◽  
Fluorescent Protein ◽  
Induced Pluripotent Stem Cell ◽  
Embryoid Bodies ◽  
Induced Pluripotent Cells ◽  
Induced Pluripotent

In order to enhance the differentiation of induced pluripotent cells into cardiomyocytes, we compared two methods of embryoid bodies formation: differentiation in rotating suspension culture and formation of embryoid bodies from a predetermined number of pluripotent stem cells in microwells of AggreWell plates. We used transgenic murine induced pluripotent stem cell line AT25. Cell line expressed IRES-flanked enhanced green fluorescent protein (eGFP) under the control of cardiac alpha myosin heavy chain promoter (αMHC). We applied flow cytometry and fluorescence microscopyin order to test the efficiency of differentiation processes. Thus, differentiation of pluripotent stem cells in AggreWell plates without adding differentiation factors was more effective than differentiation in rotating suspension culture. However, we obtained the most amounts of cardiomyocytes on the 11-th day in rotating suspension culture with ascorbic acid, after we applied dorsomorfin, DMSO, ascorbic acid, G-CSF with the above-mentioned methods. The amount of GFP + cells was 2,71 ± 0,07%.

Directed differentiation of mouse-induced pluripotent stem cells generates dopaminergic nerve

2010 ◽  
Vol 34 (8) ◽  
pp. S36-S36
Author(s):  
Ping Duan ◽  
Xuelin Ren ◽  
Wenhai Yan ◽  
Xuefei Han ◽  
Xu Yan ◽  
...  
Keyword(s):  
Stem Cells ◽  
Induced Pluripotent Stem Cells ◽  
Pluripotent Stem Cells ◽  
Directed Differentiation ◽  
Induced Pluripotent
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